CA2082652A1 - Production systems for underwater wells - Google Patents
Production systems for underwater wellsInfo
- Publication number
- CA2082652A1 CA2082652A1 CA002082652A CA2082652A CA2082652A1 CA 2082652 A1 CA2082652 A1 CA 2082652A1 CA 002082652 A CA002082652 A CA 002082652A CA 2082652 A CA2082652 A CA 2082652A CA 2082652 A1 CA2082652 A1 CA 2082652A1
- Authority
- CA
- Canada
- Prior art keywords
- caisson
- christmas tree
- umbilical
- manifold
- production system
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Abandoned
Links
- 238000004519 manufacturing process Methods 0.000 title claims description 20
- 241000191291 Abies alba Species 0.000 claims abstract description 29
- 238000005553 drilling Methods 0.000 claims abstract description 20
- 230000000712 assembly Effects 0.000 claims abstract description 19
- 238000000429 assembly Methods 0.000 claims abstract description 19
- 239000000126 substance Substances 0.000 claims description 14
- 238000002347 injection Methods 0.000 claims description 7
- 239000007924 injection Substances 0.000 claims description 7
- 239000000463 material Substances 0.000 claims description 5
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 3
- 235000004507 Abies alba Nutrition 0.000 abstract 2
- 238000012360 testing method Methods 0.000 description 8
- OKKJLVBELUTLKV-UHFFFAOYSA-N Methanol Chemical compound OC OKKJLVBELUTLKV-UHFFFAOYSA-N 0.000 description 6
- KJLPSBMDOIVXSN-UHFFFAOYSA-N 4-[4-[2-[4-(3,4-dicarboxyphenoxy)phenyl]propan-2-yl]phenoxy]phthalic acid Chemical compound C=1C=C(OC=2C=C(C(C(O)=O)=CC=2)C(O)=O)C=CC=1C(C)(C)C(C=C1)=CC=C1OC1=CC=C(C(O)=O)C(C(O)=O)=C1 KJLPSBMDOIVXSN-UHFFFAOYSA-N 0.000 description 3
- 238000009434 installation Methods 0.000 description 3
- 239000011435 rock Substances 0.000 description 3
- 241000196324 Embryophyta Species 0.000 description 2
- 238000009412 basement excavation Methods 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 2
- 239000004020 conductor Substances 0.000 description 2
- 238000010276 construction Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000001681 protective effect Effects 0.000 description 2
- 230000004888 barrier function Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 230000000994 depressogenic effect Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 229930195733 hydrocarbon Natural products 0.000 description 1
- 150000002430 hydrocarbons Chemical class 0.000 description 1
- 239000003112 inhibitor Substances 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 239000004576 sand Substances 0.000 description 1
- 239000002455 scale inhibitor Substances 0.000 description 1
- 238000009991 scouring Methods 0.000 description 1
- 239000013535 sea water Substances 0.000 description 1
Classifications
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/01—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells specially adapted for obtaining from underwater installations
- E21B43/017—Production satellite stations, i.e. underwater installations comprising a plurality of satellite well heads connected to a central station
- E21B43/0175—Hydraulic schemes for production manifolds
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B41/00—Equipment or details not covered by groups E21B15/00 - E21B40/00
- E21B41/08—Underwater guide bases, e.g. drilling templates; Levelling thereof
Landscapes
- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Geology (AREA)
- Mining & Mineral Resources (AREA)
- Physics & Mathematics (AREA)
- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Earth Drilling (AREA)
Abstract
Flowlines (28 and 30) carry oil or gas from a caisson (10), in or partly in a recess in a sea bed (12), to a land station (32) and an umbilical (36) also passes between the caisson and the land station. The lines (28 and 30) and the umbilical serve a number of Christmas tree assemblies (24) in the caisson, these being distributed around a vertical axis of the caisson and supported by a drilling template (22) in the caisson which has been used in the drilling of a corresponding number of wells. A manifold (26) lying on the axis connects all the Christmas trees to the flowlines (28 and 30).
Description
PROD~CTION SYSTE~S FOR UNDERWATER WELLS 2 0 8 2 6 5 2 This invention relates to production systems for underwater wells, particularly (but not ~xclusively) oil or gas wells.
It is known to drill a number of subsea wells using a ; drilling template to provide a subsea satellite production system, the oil or gas produced being fed to a platform terminal or shore terminal.
.
Such groups of satellite wells, which are serviced individually, have drawbacks in that there is considerable duplication of flowlines and umbilical lines between the wells and the terminal.
Accordlng to the present invention there is provided a production system for extracting material from an underwater deposit using a caisson, characterised in that there are a plurality of Christmas tree assemblies which can be accommodated simultaneously in the caisson, a drilling tempiate for use within the caisson, firstly in the drilling of wells and subsequently for supporting the Christmas tree assemblies, manifold means for connecting each Christmas tree assembly to at least one flowline, which serves all of the Christmas tree assemblies, and distribution means for connecting each Christmas tree to a power and control umbilical which serves all of the Christmas tree assemblies.
The manifold means preferably comprise connections to a production flowline and a test flowline; and the distribution means preferably comprise connections to electrical and hydraulic lines in the umbilical.
The umbilical will normally include chemical injection ~ - . : , . , ". , :-, ~
.. . . . . . ~ .
: . . '' .~
2 ~ 8 ~ 2 - PCT/GB91/007~7 hoses for the transmission of chemicals (for example methanol), in which case the drilling template will also support a chemical injection manifold for distributing the chemicals to the Christmas tree assemblies.
':
The manifold means, distribution means and chemical injection manifold are preferably modularised units which may be fitted to the template before or after it is located within the caisson. Each unit preferably has its own lock-down system to facilitate its installation or removal.
The Christmas tree assemblies are preferably four in number. Whatever the number, preferably they are distributed around a vertical axis of the caisson, on which axis the manifold means lies.
To provide physical protection and minimise the ingress of sand and silt the caisson may have a lid which is preferably slightly domed, so as to minimise scouring effect to optimise hydrodynamic loading, and preferably has a : removable cover above each Christmas tree and the manifold means to allow access by a diver.
' .
Although the invention may be carried out in a variety of different ways one particular embodiment thereof will now be described, by way of example, with reference to the accompanying drawings in which Figures I and IA are perspective views of a subsea caisson production system according to the invention, Figure IB being an expioded, cutaway and enlarced view of the caisson assembly;
Figure 2 is a vertical section through the installed caisson, -, . ..
, . : - : .
.
~ . :
' WO9t/18182 PCTIGB91/00747 2~2~52 Figure 3 is a vertical section through the caisson showing its construction in more detail;
Figure 4 is a plan corresponding to Fig. 3 of the cai3son;
Figure 5 is a plan of the caisson lid;
Figure 6 is a plan of a drilling template;
Figure 7 is an exploded side elevation of the .; .
components housed in the caisson;
: ,. ~, .
Figure 8 is an exploded plan view, partly in section, '~ of the caisson components:
r ~ . . ~ . ' .
Figure 9 is an elevation of a Christmas tree installed in the caisson;
~, Figure IO is a plan of manifold piping, and Figs. IOA
and IOB are corresponding elevations;
Figure 11 is a diagram showing the general arrangement of the production and control systems: and ~-Figure 12 is a plan of the caisson with lid removed ;; showing the caisson control system in more detail, Figure 12A being a detail of an umbilical dist-ibution unit and 'adjacent caisson wall. ~ -As shown in Figs. 1 to 4 a subsea caisson produc-ion system comprises a caisson 10 supported in an oversized sloping-sided excavation in the seabed 12 on a stabilised pre-engineered concrete foundation layer 14 through which ~','' .
:~ .
' WO 91/18182 - 4 - PCI'/GB91/00747 2 ~ 5 ~
project four conductors l6, and a central conductor l7 (see Fig. IB) these being surrounded by a protective rock dump 18. The caisson has a floor formed by a drilling template 22 on which are mounted four Christmas tree assemblies distributed around a central vertical axis ~not shown) of the caisson and a central manifold module 26 which lies on the axis and from which a production flowline 28 and a test flowline 30 run to an on-shore plant 32 via a shore crossing 34 or to a platform. An umbilical 36 which comprises electric, hydraulic and chemical lines also runs to the plant 32 in an excavated trench. Pig receivers 3l, a splitter box 33 and tie-in spools 35 are also shown.
The foundation layer l4 is laid on a fine rock dump 40 at the bot,om of the excavation ll. The excavated area surrounding the sides of the caisson lO is filled with selected fine rock dump material 42 covered by a top layer of coarse material 44 which provides a stabilised gently sloping surround extending from the top of the caisson lO to the existing seabed 12 some 2m above.
While the whole of the caisson lO and its lid 20 lie in a recess in the seabed in the illustrated installation, it is possible for part of the assembly of caisson and lid to project out of the recess so that the top of this assembly is at a higher level than that of the seabed.
The caisson lO has a l2-sided wall 46 comprising twelve double skin wall sections 48 formed of welded plates 50 and interconnected by vertical tubular members 52, the sections 48 may be flooded with sea water or illed with other material when the caisson lO has been lowered into position.
If desired the c~isson lO may be supplied with levelling mechanisms (not shown).
.. .. - . . .
WO91/18182 2 ~ 8 2 ~ ~ 2 PCT/GB91/00747 A horizontal internal ring 54 is positioned near the lower edge of the caisson wall 46 to support the drilling template 22 and is fitted with a series of drilling template installation guides 56 and drilling template lockdown brackets 58. At its upper edge the wall 46 is capped by a box-section top chord 60 surmounted by a bumper frame 62 which is interrupted for a set of four lifting eyes 64, and of flowline clamp support inserts 66.
The caisson 10 is fitted with a removable lid 20 (Fig.
5) which comprises a tubular framework 68 covered by a serrated bar grating 70, and having five removable hatches 72 to provide access to the Christmas tree assemblies 24 and manifold module 25. Four lifting eyes 74 for connection to a sling 76 (Fig. 7) are also provided.
The drilling template 22 (see Fig. 6) comprises a tubular framework 78 including two intersecting parallel pairs of tubular members 80, each terminating in a buffer 82 which on lowering of the template 22 engages the respec.ive guides 56 and is then secured by lock down brackets 58 when it has been levelled (to within 5 cm), which may be accomplished independently of the caisson 10 which is also alignable. Four frusto-conical, gimball-type guide funnels 84 are peripherally disposed and provide a facility to land drilling guide bases 86 (Fig. 7) which, after the drilling of four wells, support the Christmas tree assemblies 24. A
similar guide funnel 84 is provided centrally to receive a similar guide base 86 for the manifold 26. Between each ajdjacent pair of guide funnels 84 there is positioned a pair of umbilical distribution socket inserts ao incorporating port sockets which provide a choice of locations for mounting an umbilical distribution unit 92 (See Figs. Il and 12). Two sets of lifting eyes 94 and 96 are welded to the frame-work 78.
- . ~ . . .................................. . . .
: .. . : . ., . . . , .................... - ...... , .. . , ,, , : : :,: . . . : -~.
2l~2~2 Figure 9 shows one of the Christmas tree assemblies 24 located in the drilling template 22 by means of the drilling guide base 86 having upstanding guide posts 98 over which guide funnels ]00 of a guide frame 102 engage. A tree cap ]04 fits over the top of the frame 102 (see Figs. 7 and 8).
The Christmas tree itself (106) has a minimum of four fail-safe barriers, which are all arranged to be automatically shut in the case of alarm or emergency, and leak detection, system monitoring and data acquisition facilities, and, as its construction is generally conventional, it will not be described in detail. Exploded views of the Christmas tree assembly 24 and a tubing hanger 108 are shown in Figs. 7 and 8.
Centrally disposed on the template 22 is the manifold module 26 shown in detail in Fig. 10, and generally in the exploded diagrams of Figs. 7 and 8. The manifold module 26 is mounted on the central guide base 86 by means of a framework ]10, including four guide funnels ~]2, and is surmounted by a protective cap 1]4. The functional components of the module include a pair of tree tie-in spools 116 for each well which are all connected to a production flowline ~20 and a test flowline 118 which communicate with the flowlines 28 and 30, respectively, a pigging loop 122; and valve actuators 124. Besides allowing test flow, production flow and well-killing, the manifold module also includes piping headers which allow a chemical treatment facility such as methanol dosing to inhibit hydrate formation, pour-point depressant to prevent wax formation, corrosion inhibitor dosing and intermittent scale inhibitor. The chemicals are fed along the umbilical 36 to the umbilical distribution unit 92 and reach a chemical injection manifold 125 on the central manifold module 26 via a chemical injection jumper 126 (Fig. Il). From the .. ~- -.
.
WO91/18182 2 a ~ 2 PCT/GBg1/00747 manifold 125 the chemicals pass to the Christmas tree assemblies 24.
The umbilical distribution unit 92 is located on a desired one of the umbilical distribution socket inserts 90, being mounted on two guide posts 127 which are engaged by guide funnels 128 flanking the unit 92. The unit 92 is connected to the umbilical 36 by a jumper 130, the connection being made through a pullhead 132 received within a pulling cone 134 mounted on an insert 90. Hydraulic and electric jumpers 136 lead to a control pod 138 located by each Christmas tree assembly 24 to provide power and control therefor; and further jumpers 140 lead from each pod 138 to the central manifold module 26 to supply the valve actuators 124.
The general arrangement of the control system is shown in block form in ~ig. 11 and will not be described in detail.
It will be noted that the test flowline 118 and the production flowline 120 are connected by the pigging loop 122 so that "round trip" commissioning may be undertaken by passing the appropriate pig train through the lines. The manifold module 26 allows the flow of production hydrocarbons to either the production flowline 120 or, on an individual basis, to the test flowline 118 for well-testing purposes. In normal operation, the oil or gas from two wells passes down the production flowline 120 and that from the other two wells passes down the test flowline 118.
.:
The two unused umbilical dist-ibution socket inserts 90 may be used for further umbilicals and/or flowlines, for ~xample if it is subsequently desirable to use gas lift or water injec~ion techniques.
. .:,:, .
-. . ` . ~ . : :: ,, . :. - .. : : . -.- . ' ~: ,', ' . : . . ..
,,~, . . . ': :
It is known to drill a number of subsea wells using a ; drilling template to provide a subsea satellite production system, the oil or gas produced being fed to a platform terminal or shore terminal.
.
Such groups of satellite wells, which are serviced individually, have drawbacks in that there is considerable duplication of flowlines and umbilical lines between the wells and the terminal.
Accordlng to the present invention there is provided a production system for extracting material from an underwater deposit using a caisson, characterised in that there are a plurality of Christmas tree assemblies which can be accommodated simultaneously in the caisson, a drilling tempiate for use within the caisson, firstly in the drilling of wells and subsequently for supporting the Christmas tree assemblies, manifold means for connecting each Christmas tree assembly to at least one flowline, which serves all of the Christmas tree assemblies, and distribution means for connecting each Christmas tree to a power and control umbilical which serves all of the Christmas tree assemblies.
The manifold means preferably comprise connections to a production flowline and a test flowline; and the distribution means preferably comprise connections to electrical and hydraulic lines in the umbilical.
The umbilical will normally include chemical injection ~ - . : , . , ". , :-, ~
.. . . . . . ~ .
: . . '' .~
2 ~ 8 ~ 2 - PCT/GB91/007~7 hoses for the transmission of chemicals (for example methanol), in which case the drilling template will also support a chemical injection manifold for distributing the chemicals to the Christmas tree assemblies.
':
The manifold means, distribution means and chemical injection manifold are preferably modularised units which may be fitted to the template before or after it is located within the caisson. Each unit preferably has its own lock-down system to facilitate its installation or removal.
The Christmas tree assemblies are preferably four in number. Whatever the number, preferably they are distributed around a vertical axis of the caisson, on which axis the manifold means lies.
To provide physical protection and minimise the ingress of sand and silt the caisson may have a lid which is preferably slightly domed, so as to minimise scouring effect to optimise hydrodynamic loading, and preferably has a : removable cover above each Christmas tree and the manifold means to allow access by a diver.
' .
Although the invention may be carried out in a variety of different ways one particular embodiment thereof will now be described, by way of example, with reference to the accompanying drawings in which Figures I and IA are perspective views of a subsea caisson production system according to the invention, Figure IB being an expioded, cutaway and enlarced view of the caisson assembly;
Figure 2 is a vertical section through the installed caisson, -, . ..
, . : - : .
.
~ . :
' WO9t/18182 PCTIGB91/00747 2~2~52 Figure 3 is a vertical section through the caisson showing its construction in more detail;
Figure 4 is a plan corresponding to Fig. 3 of the cai3son;
Figure 5 is a plan of the caisson lid;
Figure 6 is a plan of a drilling template;
Figure 7 is an exploded side elevation of the .; .
components housed in the caisson;
: ,. ~, .
Figure 8 is an exploded plan view, partly in section, '~ of the caisson components:
r ~ . . ~ . ' .
Figure 9 is an elevation of a Christmas tree installed in the caisson;
~, Figure IO is a plan of manifold piping, and Figs. IOA
and IOB are corresponding elevations;
Figure 11 is a diagram showing the general arrangement of the production and control systems: and ~-Figure 12 is a plan of the caisson with lid removed ;; showing the caisson control system in more detail, Figure 12A being a detail of an umbilical dist-ibution unit and 'adjacent caisson wall. ~ -As shown in Figs. 1 to 4 a subsea caisson produc-ion system comprises a caisson 10 supported in an oversized sloping-sided excavation in the seabed 12 on a stabilised pre-engineered concrete foundation layer 14 through which ~','' .
:~ .
' WO 91/18182 - 4 - PCI'/GB91/00747 2 ~ 5 ~
project four conductors l6, and a central conductor l7 (see Fig. IB) these being surrounded by a protective rock dump 18. The caisson has a floor formed by a drilling template 22 on which are mounted four Christmas tree assemblies distributed around a central vertical axis ~not shown) of the caisson and a central manifold module 26 which lies on the axis and from which a production flowline 28 and a test flowline 30 run to an on-shore plant 32 via a shore crossing 34 or to a platform. An umbilical 36 which comprises electric, hydraulic and chemical lines also runs to the plant 32 in an excavated trench. Pig receivers 3l, a splitter box 33 and tie-in spools 35 are also shown.
The foundation layer l4 is laid on a fine rock dump 40 at the bot,om of the excavation ll. The excavated area surrounding the sides of the caisson lO is filled with selected fine rock dump material 42 covered by a top layer of coarse material 44 which provides a stabilised gently sloping surround extending from the top of the caisson lO to the existing seabed 12 some 2m above.
While the whole of the caisson lO and its lid 20 lie in a recess in the seabed in the illustrated installation, it is possible for part of the assembly of caisson and lid to project out of the recess so that the top of this assembly is at a higher level than that of the seabed.
The caisson lO has a l2-sided wall 46 comprising twelve double skin wall sections 48 formed of welded plates 50 and interconnected by vertical tubular members 52, the sections 48 may be flooded with sea water or illed with other material when the caisson lO has been lowered into position.
If desired the c~isson lO may be supplied with levelling mechanisms (not shown).
.. .. - . . .
WO91/18182 2 ~ 8 2 ~ ~ 2 PCT/GB91/00747 A horizontal internal ring 54 is positioned near the lower edge of the caisson wall 46 to support the drilling template 22 and is fitted with a series of drilling template installation guides 56 and drilling template lockdown brackets 58. At its upper edge the wall 46 is capped by a box-section top chord 60 surmounted by a bumper frame 62 which is interrupted for a set of four lifting eyes 64, and of flowline clamp support inserts 66.
The caisson 10 is fitted with a removable lid 20 (Fig.
5) which comprises a tubular framework 68 covered by a serrated bar grating 70, and having five removable hatches 72 to provide access to the Christmas tree assemblies 24 and manifold module 25. Four lifting eyes 74 for connection to a sling 76 (Fig. 7) are also provided.
The drilling template 22 (see Fig. 6) comprises a tubular framework 78 including two intersecting parallel pairs of tubular members 80, each terminating in a buffer 82 which on lowering of the template 22 engages the respec.ive guides 56 and is then secured by lock down brackets 58 when it has been levelled (to within 5 cm), which may be accomplished independently of the caisson 10 which is also alignable. Four frusto-conical, gimball-type guide funnels 84 are peripherally disposed and provide a facility to land drilling guide bases 86 (Fig. 7) which, after the drilling of four wells, support the Christmas tree assemblies 24. A
similar guide funnel 84 is provided centrally to receive a similar guide base 86 for the manifold 26. Between each ajdjacent pair of guide funnels 84 there is positioned a pair of umbilical distribution socket inserts ao incorporating port sockets which provide a choice of locations for mounting an umbilical distribution unit 92 (See Figs. Il and 12). Two sets of lifting eyes 94 and 96 are welded to the frame-work 78.
- . ~ . . .................................. . . .
: .. . : . ., . . . , .................... - ...... , .. . , ,, , : : :,: . . . : -~.
2l~2~2 Figure 9 shows one of the Christmas tree assemblies 24 located in the drilling template 22 by means of the drilling guide base 86 having upstanding guide posts 98 over which guide funnels ]00 of a guide frame 102 engage. A tree cap ]04 fits over the top of the frame 102 (see Figs. 7 and 8).
The Christmas tree itself (106) has a minimum of four fail-safe barriers, which are all arranged to be automatically shut in the case of alarm or emergency, and leak detection, system monitoring and data acquisition facilities, and, as its construction is generally conventional, it will not be described in detail. Exploded views of the Christmas tree assembly 24 and a tubing hanger 108 are shown in Figs. 7 and 8.
Centrally disposed on the template 22 is the manifold module 26 shown in detail in Fig. 10, and generally in the exploded diagrams of Figs. 7 and 8. The manifold module 26 is mounted on the central guide base 86 by means of a framework ]10, including four guide funnels ~]2, and is surmounted by a protective cap 1]4. The functional components of the module include a pair of tree tie-in spools 116 for each well which are all connected to a production flowline ~20 and a test flowline 118 which communicate with the flowlines 28 and 30, respectively, a pigging loop 122; and valve actuators 124. Besides allowing test flow, production flow and well-killing, the manifold module also includes piping headers which allow a chemical treatment facility such as methanol dosing to inhibit hydrate formation, pour-point depressant to prevent wax formation, corrosion inhibitor dosing and intermittent scale inhibitor. The chemicals are fed along the umbilical 36 to the umbilical distribution unit 92 and reach a chemical injection manifold 125 on the central manifold module 26 via a chemical injection jumper 126 (Fig. Il). From the .. ~- -.
.
WO91/18182 2 a ~ 2 PCT/GBg1/00747 manifold 125 the chemicals pass to the Christmas tree assemblies 24.
The umbilical distribution unit 92 is located on a desired one of the umbilical distribution socket inserts 90, being mounted on two guide posts 127 which are engaged by guide funnels 128 flanking the unit 92. The unit 92 is connected to the umbilical 36 by a jumper 130, the connection being made through a pullhead 132 received within a pulling cone 134 mounted on an insert 90. Hydraulic and electric jumpers 136 lead to a control pod 138 located by each Christmas tree assembly 24 to provide power and control therefor; and further jumpers 140 lead from each pod 138 to the central manifold module 26 to supply the valve actuators 124.
The general arrangement of the control system is shown in block form in ~ig. 11 and will not be described in detail.
It will be noted that the test flowline 118 and the production flowline 120 are connected by the pigging loop 122 so that "round trip" commissioning may be undertaken by passing the appropriate pig train through the lines. The manifold module 26 allows the flow of production hydrocarbons to either the production flowline 120 or, on an individual basis, to the test flowline 118 for well-testing purposes. In normal operation, the oil or gas from two wells passes down the production flowline 120 and that from the other two wells passes down the test flowline 118.
.:
The two unused umbilical dist-ibution socket inserts 90 may be used for further umbilicals and/or flowlines, for ~xample if it is subsequently desirable to use gas lift or water injec~ion techniques.
. .:,:, .
-. . ` . ~ . : :: ,, . :. - .. : : . -.- . ' ~: ,', ' . : . . ..
,,~, . . . ': :
Claims (6)
1. A production system for extracting material from an underwater deposit using a caisson (10), characterised in that there are a plurality of Christmas tree assemblies (24) which can be accommodated simultaneously in the caisson (10), a drilling template (22) for use within the caisson, firstly in the drilling of wells and subsequently for supporting the Christmas tree assemblies (24), manifold means (26) for connecting each Christmas tree assembly (24) to at least one flowline (28,30) which serves all of the Christmas tree assemblies (24), and distribution means (92) for connecting each Christmas tree to a power and control umbilical (36) which serves all of the Christmas tree assemblies (24).
2. A production system according to claim 1, characterised in that the caisson (10) is at least partly in a recess (11) in a bed beneath water and the at least one flowline (28,30) and the umbilical (36) are connected at one end to all the Christmas tree assemblies (24) or to a platform terminal above the water.
3. A production system according to claim 1 or 2, characterised in that there is supported by the drilling template (122) a chemical injection manifold (125) which supplies to the Christmas tree assemblies (24) chemicals which have been supplied by the umbilical (36).
4. A production system according to any preceding claim, characterised in that the drilling template (22) has mounted on it a plurality of locating means (90) for the distribution unit (92) whereby the latter can be installed in any chosen one of a corresponding plurality of positions.
5. A production system according to any preceding claim, characterised in that the Christmas tree assemblies (24) are distributed around a vertical axis of the caisson and the manifold means (26) lie on that axis.
6. A production system according to claim 3 and 5, characterised in that the chemical injection manifold (125) is mounted on the top of the manifold means (26).
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB9010627.9 | 1990-05-11 | ||
| GB909010627A GB9010627D0 (en) | 1990-05-11 | 1990-05-11 | Protection systems for underwater wells |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA2082652A1 true CA2082652A1 (en) | 1991-11-12 |
Family
ID=10675851
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA002082652A Abandoned CA2082652A1 (en) | 1990-05-11 | 1991-05-10 | Production systems for underwater wells |
Country Status (5)
| Country | Link |
|---|---|
| EP (1) | EP0527858A1 (en) |
| AU (1) | AU7863191A (en) |
| CA (1) | CA2082652A1 (en) |
| GB (1) | GB9010627D0 (en) |
| WO (1) | WO1991018182A1 (en) |
Families Citing this family (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1995015428A1 (en) * | 1993-12-03 | 1995-06-08 | Kvaerner Energy A.S | Method for developing an offshore hydrocarbon reservoir and an underwater station for use in exploring an offshore hydrocarbon reservoir |
| NO313298B1 (en) * | 2001-02-05 | 2002-09-09 | Fmc Kongsberg Subsea As | Method and apparatus for installing submerged oil and / or gas wells |
| GB2429990A (en) * | 2005-09-07 | 2007-03-14 | Keron Engineering Ltd | Drilling guide frame assembly |
| AU2010298814B2 (en) * | 2009-09-25 | 2015-12-10 | Aker Subsea As | Production manifold accessory |
| US9574146B2 (en) | 2012-12-18 | 2017-02-21 | Basf Se | Polymeric compositions composed of ethylene-vinyl ester copolymers alkyl (meth)acrylates, processes for production thereof and use thereof as pour point depressants for crude oils, mineral oils or mineral oil products |
| EP3507452B1 (en) * | 2016-09-02 | 2022-10-05 | FMC Technologies, Inc. | Improved subsea field architecture |
| CN110439495A (en) * | 2019-08-21 | 2019-11-12 | 中海油能源发展股份有限公司 | A kind of subsea production system protective device |
| CN113404050A (en) * | 2021-05-27 | 2021-09-17 | 中海石油(中国)有限公司 | Installation method of integrated steel cylinder underwater protection system |
| CN113898324B (en) * | 2021-09-30 | 2023-11-14 | 中海石油(中国)有限公司 | Protection system and method for underwater production below seabed mud surface |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3247672A (en) * | 1962-08-29 | 1966-04-26 | Vincent C Johnson | Underwater well head encasement structure |
| US3601189A (en) * | 1969-02-10 | 1971-08-24 | Lockheed Aircraft Corp | Underwater multiple well installation |
| AU445122B2 (en) * | 1970-12-31 | 1974-01-25 | Mobil Oil Corporation | Subsea production satellite and system comprising it |
| US4558744A (en) * | 1982-09-14 | 1985-12-17 | Canocean Resources Ltd. | Subsea caisson and method of installing same |
-
1990
- 1990-05-11 GB GB909010627A patent/GB9010627D0/en active Pending
-
1991
- 1991-05-10 WO PCT/GB1991/000747 patent/WO1991018182A1/en not_active Application Discontinuation
- 1991-05-10 EP EP91909159A patent/EP0527858A1/en not_active Withdrawn
- 1991-05-10 CA CA002082652A patent/CA2082652A1/en not_active Abandoned
- 1991-05-10 AU AU78631/91A patent/AU7863191A/en not_active Abandoned
Also Published As
| Publication number | Publication date |
|---|---|
| EP0527858A1 (en) | 1993-02-24 |
| WO1991018182A1 (en) | 1991-11-28 |
| AU7863191A (en) | 1991-12-10 |
| GB9010627D0 (en) | 1990-07-04 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| FZDE | Discontinued |